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Joint annual meeting of Swiss and Austrian Physical Societies 2017

21–25 Aug 2017
Europe/Zurich timezone

Organisation SPS

【116】 Spectroscopic perspective on the interplay between electronic and magnetic properties of doped topological insulators

24 Aug 2017, 12:15
15m
Talk Condensed Matter Physics (incl. NESY) Condensed Matter Physics (incl. NESY)

Speaker

Mr Jonas A. Krieger (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland)

Description

Recently, the quantum anomalous Hall effect has been observed in Cr and V doped (Sb,Bi)2Te3 [1]. Its eventual technological applications require a homogeneous magnetization without any contribution from dopant bands to the conduction of the system. We combine low energy muon spin rotation and soft-X-ray angle-resolved photoelectron spectroscopy (SX-ARPES) to study the magnetic and electronic properties of these materials. We observe a gradual magnetic transition with full magnetic volume fraction only at doping levels higher than 8% substitution of (Bi,Sb). In addition, resonant SX-ARPES at the V L3-edge reveals the presence of a non-dispersing impurity band at the Fermi level.

[1] C.-Z. Chang, et al., Nature Materials 14, 473 (2015)

Authors

Mr Jonas A. Krieger (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland) Dr Vladimir N. Strocov (Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland) Dr Zaher Salman (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland)

Co-authors

Prof. Cui-Zu Chang (Francis Bitter Magnet Lab, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA) Dr Marius-A. Husanu (Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland) Mrs Daria Sostina (Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland) Dr Arthur Ernst (Institut für Theoretische Physik, Johannes Kepler Universität, A 4040 Linz, Austria) Dr Mikhail Otrokov (Departamento de Física de Materiales UPV/EHU, Centro de Física de Materiales CFM - MPC and Centro Mixto CSIC-UPV/EHU, 20080 San Sebastián/Donostia, Spain) Dr Thomas Prokscha (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland) Dr Andreas Suter (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland) Dr Maia G. Vergniory (Donostia International Physics Center, P. Manuel de Lardizabal 4, San Sebastián, 20018 Basque Country, Spain) Prof. Evgeny V. Chulkov (Donostia International Physics Center, P. Manuel de Lardizabal 4, San Sebastián, 20018 Basque Country, Spain) Prof. Jagadeesh S. Moodera (Francis Bitter Magnet Lab, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA)

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